This only has 512MB it seems, which is odd because the other models have 1GB. I didn't know stores sold Pi competitors with 4GB RAM. Do you know of any with pc

This only has 512MB it seems, which is odd because the other models have 1GB. I didn't know stores sold Pi competitors with 4GB RAM. Do you know of any with pcie and 4+GB RAM? I'd love to have a board with enough SATA and RAM for a decent ZFS setup, and I think I can get a pcie expansion board with SATA to work.